Investigation and life expectancy prediction on poly(ether-ether-ketone) cables for thermo-oxidative aging in containment dome of nuclear power plant
Investigation and life expectancy prediction on poly(ether-ether-ketone) cables for thermo-oxidative aging in containment dome of nuclear power plant
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核电站安全壳穹顶聚醚醚酮电缆热氧化老化研究及寿命预测
DOI：
10.1016/j.polymertesting.2021.107362
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发表时间：
2021-11
期刊：
影响因子：
5.1
通讯作者：
Hongjuan Ma
中科院分区：
文献类型：
--
作者：
Renhao Ding;Lu Xu;Jianxi Li;Jian Liao;Jiejun Wang;Ziqiang Wang;Hongjuan Ma
聚醚醚酮（PEEK）电线电缆作为一种特殊的工程材料，广泛应用于核电站安全壳中，易受多种复杂因素的长期累积影响。其中，长时间在高温环境中的热氧老化是导致PEEK电缆降解甚至失效的关键因素。因此，在这项工作中，PEEK电缆在310 °C下进行不同时间的热氧化老化，并研究对PEEK物理化学性能的影响。以断裂伸长率为评价参数，采用人工加速老化模型对PEEK电缆的老化寿命进行了有效预测。结果表明，随着老化时间的延长，PEEK样品的热稳定性和结晶度明显下降。长时间的热氧老化会加速氧化分解，改变样品的形貌。此外，PEEK电缆的耐刮擦性和弯曲强度在480 h老化后明显减弱。最终预测建议PEEK电缆样品在90 °C工作温度下的使用寿命可达73年。
As a special engineering material, poly(ether-ether-ketone) (PEEK) wires and cables are widely applied in the containment vessel of nuclear power plant and vulnerable to long-term cumulative effects of multiple complex factors. Wherein, thermo-oxidative aging in high temperature environment for a long time is the key factor to lead to the degradation even failure of PEEK cables. Therefore, in this work, PEEK cables were subjected to thermo-oxidative aging for different times at 310 °C and the effects on the physicochemical properties of PEEK were investigated. Furthermore, the aging life expectancy of PEEK cables was effectively predicted by the innovative artificial accelerated aging model with breaking elongation as evaluation parameter. The results revealed the thermal stability and crystallinity of PEEK samples declined significantly with the extension of aging time. Prolonged thermo-oxidative aging can accelerate the oxidation decomposition and change the sample morphologies. Moreover, the scratch resistance and bending strength of PEEK cables were significantly weakened after 480 h aging. The final prediction suggested that the service life expectancy of PEEK cable samples can reach 73 years at the working temperature of 90 °C.
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DOI：
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